<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>10_盒子的外边距_margin</title>
    <style>
        div {
            width: 400px;
            height: 400px;

            /* margin-left: 10px; */
            /* margin-right: 20px; */
            /* margin-top: 30px; */
            /* margin-bottom: 40px; */

            /* margin: 50px; */
            /* margin: 10px 20px; */
            /* margin: 10px 20px 30px; */
            /* margin: 10px 20px 30px 40px; */

            background-color: skyblue;
        }
    </style>
</head>
<body>
    <div>你好啊</div>
</body>
</html>